While filming a promotional spot, a base jumper plummets to his death after his parachute is punctured by pigeons, leading the CSIs to the competitive world of pigeon racing and to a second victim, a prominent trainer who was also murdered.

While investigating the death of a base jumper, Mac, Danny and Det. Flack discover the body of a trainer found brutally murdered on his roof and whose pigeons where poisoned. Meanwhile, Stella, Lindsay and Dr. Hawkes arrive at an elaborate Sweet 16 party that turned deadly when the birthday girl's father is found dead behind the wheel of her new $60,000 dollar car.

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